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Water system · PWSID CA4900640

SONOMA COUNTY MUTUAL WATER COMPANY

SAN FRANCISCO, CA · ~40 people served

Check your exact address → SAN FRANCISCO overview
100
Excellent
PurityRadar safety score

PWSID

CA4900640

State

California

City

SAN FRANCISCO

Population served

40

Primary source

GU

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

88

Violations on record

0

Unaddressed

84

Health-based

11

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Nov 2020. Official EPA record →

Treatment technique · EPA contaminant 0200 health-based began Jul 2020 Resolved
Treatment technique · EPA contaminant 0200 health-based began Aug 2019 Resolved
Treatment technique · EPA contaminant 0200 health-based began Jul 2019 Resolved
Treatment technique · EPA contaminant 0200 health-based began Jun 2019 Resolved
Treatment technique · EPA contaminant 0200 health-based began May 2019 Resolved
Treatment technique · EPA contaminant 0200 health-based began Apr 2019 Resolved
Treatment technique · EPA contaminant 0200 health-based began Mar 2019 Resolved
Treatment technique · EPA contaminant 0200 health-based began Feb 2019 Resolved
Treatment technique · EPA contaminant 0200 health-based began Jan 2019 Resolved
Treatment technique · EPA contaminant 0200 health-based began Dec 2018 Resolved
Treatment technique · EPA contaminant 0200 health-based began Nov 2018 Resolved
Treatment technique · EPA contaminant 0200 health-based began Oct 2018 Resolved

Recent enforcement actions

  • State action · SOX Nov 2020
  • State action · SFO Jul 2020
  • State action · SOX Aug 2019
  • State action · SFL Feb 2012
  • State action · SOX Jan 2006
  • State action · SFL Jan 2006
  • EPA/federal action · EOX Dec 2003
  • State action · SOX Dec 1997

This profile is built from EPA public records for system CA4900640 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.